JP2000002901A - Mechanism for locking of vibration proof lens for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and surely lock a vibration proof lens to a lens barrel by arranging locking rings on both sides of the lens frame body of the vibration proof lens and turning an operating ring so that the locking rings are moved in a direction that the locking rings come close to each other and interpose and hold the lens frame body with pressure. SOLUTION: This mechanism is constituted of the locking rings 50 and 52, and the operating ring 54. The rings 50 and 52 are arranged on a position where they interpose the lens frame body 14 of the vibration proof lens 12 from the front and the back of an optical axis. The rings 50 and 52 are freely movably guided back and forth in an optical axis L direction by a pin 58, and also moved in the direction that they come close to each other by the ring 54 while linking with the ring 54. That is, when the lens 12 is locked, the ring 54 is operated to make the rings 50 and 52 come close to each other, and the body 14 is interposed and held by the rings 50 and 52 with the pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock mechanism for a vibration-proof lens of a camera, and more particularly to a lock mechanism for temporarily fixing a vibration-proof lens for correcting image blur caused by vibration applied to the camera to a lens barrel.

[0002]

2. Description of the Related Art Conventionally, a camera equipped with a vibration-proof lens of this type has a vibration-proof lens movably supported in a lens barrel of the camera in a plane perpendicular to the photographing optical axis. ,
The image blur is corrected by moving the anti-vibration lens by an actuator in a direction to cancel the vibration.

By the way, such a camera is provided so that the anti-vibration lens does not move and is damaged in the lens barrel when the camera is transported, and when the camera is hardly vibrated and the anti-vibration function is not required. A lock mechanism for fixing the lens to the lens barrel is provided. A conventional locking mechanism is configured to form a hole in a lens holding frame of an anti-vibration lens and insert a positioning pin into the hole, thereby locking the anti-vibration lens to the lens barrel via the positioning pin. .

[0004]

However, in the conventional lock mechanism of the vibration-proof lens, it is necessary to minimize the gap between the hole and the positioning pin in order to eliminate backlash at the time of locking. There is a drawback that the positioning pin cannot be easily pulled in and out at the time of release, which takes time and effort. Further, since the conventional lock mechanism locks the anti-vibration lens at one place, there is a drawback in that a play in the rotation direction occurs around the positioning pin, and the anti-vibration lens also falls down.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a lock mechanism of a camera shake preventing lens which can easily and securely lock the camera shake preventing lens.

[0006]

In order to achieve the above object, the present invention corrects image blur caused by vibration applied to a camera by being moved in a plane orthogonal to an optical axis in a lens barrel. In the lock mechanism of the anti-vibration lens of the camera, the lock mechanism is supported by the lens barrel,
A pair of squeezing members arranged movably in the optical axis direction on both sides of a lens holding frame that supports the anti-vibration lens, and an operation member that can relatively move the pair of squeezing members forward and backward; The operation member moves the pair of clamping members in a relatively approaching direction, and clamps and holds the lens holding frame by the pair of clamping members to thereby move the anti-vibration lens to the lens barrel. It is characterized by being locked against.

According to the first aspect of the present invention, the operating member is operated to move the pair of squeezing members in a relatively approaching direction, and the pair of squeezing members press the lens holding frame of the vibration-proof lens. Hold. Thus, according to the present invention, the anti-vibration lens can be easily and securely locked. According to the second aspect of the present invention, since the pair of holding members are formed in a ring shape so as to hold the entire circumference of the lens holding frame, the anti-vibration lens can be locked more reliably. Thus, according to the present invention, it is possible to prevent rattling or tilting of the vibration-proof lens in the rotation direction.

According to the third aspect of the present invention, since the pair of pressing members are screwed and connected to the operating member by mutually reverse screws, the direction in which the pair of pressing members approach each other by rotating the operating member in one direction. , And the pair of pressing members can be moved in a direction away from each other by turning in the other direction. Therefore, in the present invention, the pair of pressing members can be easily operated.

According to the fourth aspect of the present invention, the pressing support portion of the pressing member and the contact portion of the lens holding frame are formed as tapered surfaces, and the tapered surface of the pressing support portion is formed as the contact portion. By pressing the tapered surface, the lens holding frame is guided by the tapered surface of the pinch support, and the optical axis of the anti-vibration lens is aligned with the optical axis of the entire optical system. This is particularly advantageous when used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a lock mechanism for a vibration-proof lens of a camera according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a front view showing an anti-vibration lens to which a lock mechanism of an anti-vibration lens of a camera according to an embodiment of the present invention is applied. As shown in FIG. 1, an anti-vibration lens 12 is disposed in a lens barrel 10 of a camera lens while being held by a lens frame 14. The image stabilizing lens 12 is moved by linear motors 16 and 18 in a direction perpendicular to the photographing optical axis L in a direction in which image blur is corrected. Also, the anti-vibration lens 12
Is movably supported by the lens barrel 10 via a parallel link mechanism including four arms 20 and 22.

The linear motor 16 moves the anti-vibration lens 12 in the horizontal direction in the figure, and includes a motor body 16A and a rod 16B. The motor body 16A is
The rod 16B is fixed to the lens barrel 10, and the tip of the rod 16B is engaged with the elongated hole 24 of the lens frame 14 via a roller 26. The elongated hole 24 is formed on the left side of the lens frame 14 in the vertical direction in the figure, and therefore, the elongated hole 24 and the roller 26 are relatively movably engaged in the vertical direction in the figure.

When the rod 16B of the motor body 16A expands and contracts, the lens frame 14 is pushed by the rod 16B,
Or it is pulled by the rod 16B and moves in the left-right direction in FIG. When a vertical force is applied to the lens frame 14,
The long hole 24 is guided by the roller 26, and the image stabilizing lens 12 moves in the vertical direction. The rod 1 of the linear motor 16
A connection frame 28 is fixed to 6B. This connection frame 2
8 are arranged vertically, and the rod 16B
Are fixed, and the upper and lower ends are linear guides 30, 3 respectively.
0 is slidably supported. The linear guide 3
The reference numerals 0 and 30 are provided in parallel with the rod 16B, so that when the rod 16B is expanded or contracted, the connecting frame 28 moves in a horizontal direction while maintaining its posture.

The tip of a contact needle 32B for detection of a position sensor 32 is pressed against the connection frame 28. The position sensor 32 is configured such that the detection contact needle 32B is
The sensor body 32A is positioned at a position parallel to
The amount of movement of the connection frame 28, which is fixed to 0 and moves in parallel by the expansion and contraction of the rod 16B, is detected. The position sensor 32 of the present embodiment does not directly contact the detection contact needle 32B with the peripheral surface of the lens frame 14, but indirectly detects the amount of movement of the anti-vibration lens 12. Is in contact with As described above, since the connection frame 28 moves in parallel while maintaining the attitude regardless of the amount of expansion and contraction of the rod 16B, the detection contact needle 32B does not shift or slip from the connection frame 28 during the movement.

Reference numeral 34A denotes a speed generator 34.
Is a core constituting the speed generator 34, and the core 34 B is fixed to the connection frame 28. On the other hand, the linear motor 18 moves the image stabilizing lens 12 in the vertical direction, and includes a motor body 18A and a rod 18B. Motor body 1
8A is fixed to the lens barrel 10, and the tip of the rod 18B is engaged with the long hole 36 of the lens frame 14 via the roller 38. The long hole 36 is formed in the lower part of the lens frame 14 in the left-right direction, so that the long hole 36 and the roller 38 are relatively movably engaged in the left-right direction.

The rod 18B is driven by the driving force of the motor body 18A.
When the lens expands / contracts, the lens frame 14 moves vertically by being pushed by the rod 18B or pulled by the rod 18B. Also, when a lateral force is applied to the lens frame 14,
The long hole 36 is guided by the roller 38, and the vibration-proof lens 12 moves in the left-right direction. The rod 1 of the linear motor 18
The connection frame 40 is fixed to 8B. The connecting frame 40 is disposed in the left-right direction, the rod 18B is fixed to the center, and the left and right ends are slidably supported by the linear guides 42, 42, respectively. The linear guides 42, 42
Is provided in parallel with the rod 18B, so that when the rod 18B is expanded and contracted, the connecting frame 40 moves up and down while maintaining its posture.

The distal end of a contact needle 44B for detection of a position sensor 44 is pressed against the connection frame 40. The position sensor 44 includes a connection frame 40 in which the sensor main body 44A is fixed to the lens barrel 10 at a position where the detection contact needle 44B is parallel to the rod 18B, and which is moved in parallel by the expansion and contraction of the rod 18B.
The amount of movement of is detected. Similarly to the position sensor 32, the position sensor 44 does not directly contact the detection contact needle 44B with the peripheral surface of the lens frame 14, but can indirectly detect the movement amount of the anti-vibration lens 12. It is in contact with the frame 40. Since the connection frame 40 moves in parallel while maintaining the posture regardless of the amount of expansion and contraction of the rod 18B, the detection contact needle 44B does not shift or slip from the connection frame 40 during the movement.

Reference numeral 46A denotes a speed generator 46.
Is a core constituting the speed generator 46, and the core 46 B is fixed to the connection frame 40. The lens barrel 10 is provided with two angular velocity sensors (not shown). One angular velocity sensor is provided on the side of the lens barrel 10 and the other angular velocity sensor is provided on the upper part of the lens barrel. The former angular velocity sensor is
Among the vibrations transmitted to the lens barrel 10, vibration in the left-right direction component is detected, and the detected information is represented by C (not shown).
Output to PU. The CPU calculates a correction movement amount in the left-right direction to be given to the anti-vibration lens 12 based on information from the angular velocity sensor. The signal indicating the correction movement amount in the left-right direction is amplified by an amplifier, and then amplified by the linear motor 16.
Is output to The linear motor 16 extends or contracts the rod 16B by an amount corresponding to the signal from the CPU.

On the other hand, the latter angular velocity sensor detects the vertical component of the vibration transmitted to the lens barrel 10, and the detected information is output to the CPU. CP
U calculates a vertical correction amount to be given to the anti-vibration lens 12 based on information from the angular velocity sensor, and outputs a signal indicating the vertical correction amount to the linear motor 18 via the amplifier. . The linear motor 18 has a CP
The rod 18B is extended or contracted by an amount corresponding to the signal from U. As a result, the image blur caused by the vibration applied to the camera is corrected by the anti-vibration lens 12.

FIG. 2 is a sectional view of a principal part showing a first embodiment of the lock mechanism of the vibration proof lens 12. As shown in FIG. The lock mechanism shown in the figure includes a pair of lock rings (pressing members) 5.
0, 52 and an operation ring (operation member) 54. The lock ring 50 is disposed in front of the optical axis L of the lens frame 14 of the anti-vibration lens 12, and the lock ring 52 is connected to the optical axis L of the lens frame 14.
Is arranged rearward with respect to

A hole 56 is formed in each of the lock rings 50 and 52 in parallel with the optical axis L. This hole 56
Are formed at predetermined intervals on the surfaces of the lock rings 50, 52. Pins 58, 58 projecting from the lens barrel 10 side are loosely inserted into the holes 56, 56,. Therefore, the lock rings 50 and 52 are
. Are supported by the lens barrel 10 via the pins 8, 58,... And guided by the pins 58, 58,. The movement stroke of the lock rings 50 and 52 is set between a position where the lock rings 50 and 52 can sufficiently hold the lens frame 14 by pressure and a position where the lens frame 14 is separated from the lens frame 14 by a predetermined distance.

A helicoid screw 60 is formed on the outer peripheral surface of the lock ring 50, and the helicoid screw 60 is screwed to a helicoid screw 62 formed on the front inner peripheral surface of the operation ring 54. In addition, lock ring 5
A helicoid screw 64 is also formed on the outer peripheral surface of the operation ring 2, and the helicoid screw 64 is screwed to a helicoid screw 66 formed on the inner peripheral surface on the rear side of the operation ring 54. Therefore, when the operation ring 54 is rotated in one direction, the lock rings 50 and 52 move toward each other by the action of the helicoid screw and the straight action of the pin 58. Further, when the operation ring 54 is rotated in the other direction, the lock rings 50 and 52 can move in a direction away from each other by the above-described operation. The operation ring 54 is
An outer peripheral surface located outside the lens barrel 10 is formed as an operation surface 54A, and is configured to be manually operated.

The clamping support portion 68 of the lock ring 50 is formed on a tapered surface which is lower left in FIG.
The contact portion 70 of the lens frame 14 facing the clamping support portion 68 is also formed with a tapered surface falling leftward. On the other hand, the pinching support portion 72 of the lock ring 52 is formed on a tapered surface which is lower rightward in FIG. 2, and the contact portion 74 of the lens frame 14 facing the pinching support portion 72 is similarly tapered rightward. Formed on the surface. Therefore, the lock ring 5
When the movements 0 and 52 move toward each other, the clamping support portion 68 presses and contacts the contact portion 70, and the clamping support portion 72 presses and contacts the contact portion 74. And the lock ring 50,
With the continuous movement of 52, the lens frame 14 is guided by the tapered surfaces of the clamping support portions 68 and 72 and is moved by a small amount. Then, the optical axis of the anti-vibration lens 12 is aligned with the optical axis L of the entire optical system. Thus, the tapered surface is formed.

Therefore, according to the lock mechanism of the first embodiment configured as described above, the operation ring 54 is rotated to move the pair of lock rings 50 and 52 in a direction approaching each other to lock the lock ring. The lens frames 14 of the anti-vibration lens 12 are held by the rings 50 and 52 from the front and rear of the optical axis L. Thereby, the anti-vibration lens 12 can be easily and securely locked.

In the first embodiment, since the lock rings 50 and 52 and the lens frame 14 are formed in a ring shape so as to hold the entire circumference of the lens frame 14, only a part of the lens frame 14 is sandwiched. The anti-vibration lens 12 can be locked more securely than holding the pressure. As a result, it is possible to reliably prevent the vibration-proof lens 12 from rattling in the rotation direction or falling.

In the first embodiment, the lock rings 50 and 52 are screwed and connected to the operation ring 54 with reverse screws, so that the lock rings 50 and 52 can be connected to each other by rotating the operation ring 54 in one direction. The lock rings 50 and 52 can be moved in a direction to move away from each other by turning in the other direction. Therefore, the operation of the lock rings 50 and 52 becomes very simple.

Furthermore, in the first embodiment, the pressure holding portions of the lock rings 50 and 52 and the lens frame 14 are formed with tapered surfaces, and the lock rings 50 and 52 hold the lens frame 14 with pressure. Sometimes, the optical axis of the anti-vibration lens 12 is aligned with the optical axis L of the entire optical system, which is particularly advantageous when the anti-vibration lens 12 is locked and used. FIG. 3 is a sectional view of a main part showing a second embodiment of the lock mechanism.
Members that are the same as or similar to the lock mechanism shown in FIG. 2 are given the same reference numerals, and descriptions thereof are omitted.

The difference between the lock mechanism of FIG. 3 and the lock mechanism of FIG. 2 is that the operation ring 54 is an operation ring 54A for the lock ring 50 and an operation ring 54 for the lock ring 52.
B and these operation rings 54A, 54A
B is connected by a screw 55. When the operation rings are separately formed in this manner, the formation of the helicoid screws 62 and 66 on the operation ring side becomes easy.

FIG. 4 is a sectional view of a principal part showing a third embodiment of the lock mechanism. The same or similar members as those of the lock mechanism shown in FIG. I do. The difference between the lock mechanism in FIG. 4 and the lock mechanism in FIG. 2 is that the operation ring 54 is an operation ring 80 for the lock ring 50 and an operation ring 82 for the lock ring 52.
And helicoid screws 84 and 86 in the same direction are formed on the operation rings 80 and 82, the helicoid screw 84 is screwed into the helicoid screw 88 of the lock ring 50, and the helicoid screw 86 is connected to the lock ring 52. In that it is screwed to the helicoid screw 90 of FIG. Although the access to the operation ring is performed at two places, it is exemplified that the operation ring may be operated separately.

Also, as shown in FIG. 4, the operating rings 80 and 82 are separately operable so that the clamping support portion 68 of the lock ring 50 (or the lock ring 52) can be moved vertically as shown in FIG. The lens frame 14 can be formed on an extended straight surface.
May be formed on the straight surface. That is, according to the lock mechanism of FIG.
0 is moved toward the lens frame 14, the clamping support portion 68 of the lock ring 50 is brought into contact with the contact portion 70 of the lens frame 14, and the lens frame 14 is positioned. After this,
By moving the lock ring 52 toward the lens frame 14, the clamping support portion 72 of the lock ring 52 is moved to the lens frame 1.
4 is pressed against the contact portion 74. As a result, the optical axis of the anti-vibration lens 12 is aligned with the optical axis L of the entire optical system, and the lens frame 14 is held by the lock rings 50 and 52 under pressure.

In the present embodiment, the lock rings 50 and 52 formed as rings are described as examples of the pressing member. However, the shape of the pressing members is not limited to the ring shape. Any shape may be used as long as it can hold the lens frame 14 with the pressure.

[0031]

As described above, according to the locking mechanism of the vibration-proof lens of the camera according to the present invention, the operating member moves the pair of pressing members in a relatively approaching direction. Since the lens holding frame of the anti-vibration lens is held by the pressure, the anti-vibration lens can be easily and reliably locked.

Further, according to the present invention, since the pair of pressing members are formed in a ring shape so as to hold the entire circumference of the lens holding frame, the anti-vibration lens can be more securely locked. Further, according to the present invention, the pair of pressing members are screwed and connected to the operating member with reverse screws, so that the operation of the pair of pressing members is facilitated. Further, according to the present invention, the clamping support portion of the clamping member and the contact portion of the lens holding frame are formed with tapered surfaces, and the lens holding frame is guided by the tapered surface of the clamping support portion to form the anti-vibration lens. Since the optical axis is aligned with the optical axis of the entire optical system, it is particularly advantageous when the anti-vibration lens is locked and used.

[Brief description of the drawings]

FIG. 1 is a front view of an anti-vibration lens to which a lock mechanism of an anti-vibration lens of a camera according to the present invention is applied.

FIG. 2 is a cross-sectional view of a principal part showing a first embodiment of a lock mechanism of an anti-vibration lens.

FIG. 3 is a cross-sectional view of a principal part showing a second embodiment of a lock mechanism of an anti-vibration lens.

FIG. 4 is a sectional view of a main part showing a third embodiment of a lock mechanism of an anti-vibration lens.

FIG. 5 is a sectional view of a main part showing a fourth embodiment of a lock mechanism of an anti-vibration lens.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Lens barrel 12 ... Anti-vibration lens 14 ... Lens frame 16, 18 ... Linear motor 50, 52 ... Lock ring 54 ... Operation ring 56 ... Straight hole 58 ... Straight pin 68, 72 ... Lock ring side Nipping support portions 70, 74: contact portions on the lens frame side

Claims (4)

[Claims] 1. A lock mechanism for a vibration-proof lens of a camera for correcting image blur caused by vibration applied to the camera by being moved in a plane orthogonal to an optical axis in a lens barrel, wherein the lock mechanism comprises: A pair of pressure members supported by the lens barrel and movably arranged in the optical axis direction on both sides of a lens holding frame for supporting the image stabilizing lens; An operating member that can be moved; and the operating member moves the pair of pressing members in a direction of relatively approaching, and holds the lens holding frame by the pair of pressing members. A vibration-proof lens locking mechanism for a camera, characterized in that the vibration-proof lens is locked with respect to the lens barrel. 2. The camera according to claim 1, wherein said pair of holding members are formed in a ring shape so as to hold the entire circumference of said lens holding frame. Lock mechanism. 3. The pressing member according to claim 1, wherein one of the pressing members and the other pressing member of the pair of pressing members are screwed to each other with a reverse screw to the operating member. 2. A lock mechanism for an anti-vibration lens of the camera according to 1. 4. A pressing support portion of at least one of the pair of pressing members and a contact portion of the lens holding frame with which the pressing support portion is in contact with each other. By pressing the tapered surface of the clamping support portion against the tapered surface of the contact portion, the lens holding frame is guided by the tapered surface of the clamping support portion, and the optical axis of the anti-vibration lens is optically adjusted. 3. The locking mechanism for a vibration-proof lens of a camera according to claim 1, wherein the locking mechanism is aligned with the optical axis of the entire system.